Show the signup link

app/views/devise/shared/_links.haml

 - if controller_name != 'sessions'
   = link_to "Sign in", new_session_path(resource_name)
   %br/
-/- if devise_mapping.registerable? && controller_name != 'registrations'
-/= link_to "Sign up", new_registration_path(resource_name)
-/%br/
+- if devise_mapping.registerable? && controller_name != 'registrations'
+  = link_to "Sign up", new_registration_path(resource_name)
+  %br/
 - if devise_mapping.recoverable? && controller_name != 'passwords'
   = link_to "Forgot your password?", new_password_path(resource_name)
   %br/